Code to erase blank before and after string in C/C++

gistfile1.cpp

char * space_remove(char *str)
{
  // change BUF_SIZE depending on the length of your string
	char buf[BUF_SIZE]={0,};
	char *p;
	p = strtok(str, "\r\n\t ");
	strcat(buf, p);
	while(p!=NULL){
		p = strtok(NULL, "\r\n\t ");
		if(p!=NULL) {
			strcat(buf, " ");
			strcat(buf, p);
		}
	}
	memset(str, '\0', BUF_SIZE);
	strcpy(str, buf);
	return str;
}